Rubber shoe-bottom



W. MACPHERSON.

RUBBER SHOE BOTTOM.

APPLICATION FILED IAN.26. |920.

1, 350, 9 30, PIII-,med Aug. 24, 1920.

2 y y? Wwf figo :vz @Sys UNITED STATES PATENT OFFICE.

RUBBER SHOE-BOTTOM.

Specification of Letters Patent.

Patented Aug. 24, 1920.

Application led January 26, 1920. Serial No. 353,995.

To all whom t may concern:

Be it known that I, WARREN MAGPHER- soN, a citizen of the United States,residing at Cambridge, in the county of Middlesex and State ofMassachusetts, have invented new and useful Improvements in RubberShoe-Bottoms, of which the following is a specification.

This invention relates to a rubberl shoe bottom comprising a rubber solehaving a foro portion, a shank portion, and a heel portion, and a rubberheel body associated with the heel portion and united thereto, theentire bottom being adapted to be attached as one part to a boot orshoe, and forming the entire tread portion of the latter.

he object of the invention is to enable the rubber heel body to bestripped from theI heel portion of the sole, when the heel body has beenrendered useless by wear, so that an unworn heel body may be substitutedfor one which is worn out.

rlf'he invention is embodied in the improvements which l will nowproceed to describe and claim.

Of the accompanying drawings forming a part of this speciiication,-

Figure 1 is a view of the under side of a shoe bottom embodying theinvention.

Fig. 2 is a section on line 2 2 of Fig. 1.

Fig. 3 is a view similar to Fig. 2, showing the heel body after it hasbeen reduced by wear.

F ig. 4 is a sectional view of the heel por tion of the sole after theheel body has been stripped therefrom.

rlhe same reference characters indicate the same parts in all of thefigures.

In the drawings, 12 represents the fore portion, 13 the shank portion,and 14 the heel portion of a rubber sole molded in one piece. 15represents a rubber heel body associated with the heel portion 14, andprovided with the usual sockets 1G and metal washers 17, permitting theattachment of the heel body and heel portion 14 to a boot or shoe by theusual attaching nails.

ln carryino' out my invention, l interpose between the heel portion 14and body 15 a layer 18 of relatively weak material, such as textilefabric or paper, said layer being united to the proximate surface of theheel portion and body, and forming a rupturable connection therebetween,so that the body 15 may be stripped from the heel portion 14 to permit anew heel body to be substituted for one which has been reduced by wear.

In practice the heel body 15 is preferably formed in a suitable mold,from unvulcanized rubber, the layer 18 is placed upon the upper surfaceof the body 15 before vulcanization, and the heel portion 14 is placedupon the layer 18, also before xfulcanizing, the parts being containedin a suitable vulcanizino' mold and subjected to vulcanizing heat. i" heheel portion 14 and heel body 15 are united to the layer 18 by thevulcanizing operation.

When the body 15 has been reduced by wear, as indicated by Fig. 3, theattaching nails may be removed and the remnant of the body 15 may thenbe stripped from the heel portion 14, leaving the latter in thecondition shown by Fig. 4, so that a new body 15 may be subsequentlysecured to the heel portion by any suitable means, such as cement or bya set of attaching nails, or both.

It will be seen that the layer 18 covers the under surface of the heelportion 14, and

has a curved edge portion registering with the curved margin of the heelportion, and a breast edge portion extending across the bottom of therubber sole. It will also be seen that the curved edge portion and thebreast edge portion of the rubber heel body 15 register respectively,with the curved edge portion and the breast edge portion of the layer18, so that when the heel body is stripped from the heel portion 14, aseat is left on the latter, as shown by Fig. 4, to vwhich anotherduplicate heel body may be applied.

I claim:

A shoe bottom attachable as a single part to Va shoe, and comprising arubber sole formed as a single integral part, and including a foreportion, a shank portion, and

a heel portion, a layer of rupturable material covering the undersurface of the heel portion and having a curved edge portion registeringwith the curved margin of the heel portion, and a breast edge portionextending across the bottom of the sole, and a rubber heel body, thecurved edge portion and breast edge portion ofwbieh register adapted tobe stripped from the heel porrespeotively with the curved edge portiontion to leave on the latter a seat to which and the breast edge portionof the said layer, another duplicate heel body may be applied. 10 saidheel body being provided Witbmeans In testimony whereof I have affixedmy for engaging attaching nails, the said heel signature.

portion7 Iayeigrand heel body being united Y f by vulcanization, and theheel body being Y WARREN MACPHERSON.

